Blueberry Cream Cheese Coffee Cake:

Instructions:

1. Preheat oven to 350°F. Grease and flour a 9-inch round cake pan.
2. In a large mixing bowl, cream together the 5 1/2 tbsp of unsalted butter and cream cheese until smooth.
3. Add in the egg, egg yolk, and vanilla and mix until combined.
4. In a separate bowl, whisk together the flour, baking powder, baking soda, and salt. Gradually add the flour mixture to the butter mixture and mix until just combined.
5. Fold in the blueberries.
6. In a separate bowl, beat the egg white until stiff peaks form. Gently fold the egg white into the batter.
7. Pour the batter into the prepared pan and smooth the top with a spatula.
8. In a small saucepan, melt the 3 tbsp of butter. Add in the sugar and stir until the mixture is smooth.
9. Pour the sugar mixture over the batter.
10. In a small bowl, mix together the sour cream and remaining sugar. Drop spoonfuls of the mixture over the batter.
11. Bake the cake for 35-40 minutes or until a toothpick inserted into the center comes out clean.
12. Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
13. Serve and enjoy!